Class: NumRu::GPhys::Grib::GribBDS

Inherits:
Object
  • Object
show all
Includes:
NumRu::GPhys::GribUtils
Defined in:
lib/numru/gphys/grib.rb

Overview

end definition of class GribBMS

Instance Method Summary collapse

Instance Method Details

#bit_maps? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1176

def bit_maps?
  return flag7 && flag7==1
end

#complex? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1127

def complex?
  return flag2==1
end

#constant? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1187

def constant?
  return flag8 && flag8==0
end

#efactor ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1204

def efactor
  return @efactor if @efactor
  @sgm.file.seek(@pos+1, ::IO::SEEK_SET)
  @efactor = 2.0**str2int2( @sgm.file.read(2) )
  return @efactor
end

#float? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1136

def float?
  return flag3==0
end

#get ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1347

def get
  uint2str(length,3) << @bds
end

#grid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1100

def grid?
  return flag1==0
end

#integer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1145

def integer?
  return flag3==1
end

#length ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1093

def length
  if @pos
    return @length
  else
    return @bds.length+3
  end
end

#matrix? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1165

def matrix?
  return flag6 && flag6==1
end

#offset ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1198

def offset
  return @offset if @offset
  @sgm.file.seek(@pos+3, ::IO::SEEK_SET)
  @offset = float_value(@sgm.file.read(4))
  return @offset
end

#set_bit_map(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1179

def set_bit_map(l)
  @oct14 = oct14&0xbf
  @oct14 += 64 if l
  @oct4 = (oct4&0xef)+16
  @bds[0,1] = uint2str(@oct4,1)
  @bds[10,1] = uint2str(@oct14,1)
  return l
end

#set_complex(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1130

def set_complex(l)
  @oct4 = oct4&0xbf
  @oct4 += 64 if l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_constant(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1190

def set_constant(l)
  @oct14 = oct14&0xdf
  @oct14 += 32 unless l
  @oct4 = (oct4&0xef)+16
  @bds[0,1] = uint2str(@oct4,1)
  @bds[10,1] = uint2str(@oct14,1)
  return l
end

#set_float(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1139

def set_float(l)
  @oct4 = oct4&0xdf
  @oct4 += 32 unless l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_grid(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1103

def set_grid(l)
  @oct4 = oct4&0x7f
  @oct4 += 128 unless l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_integer(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1148

def set_integer(l)
  @oct4 = oct4&0xdf
  @oct4 += 32 if l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_matrix(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1168

def set_matrix(l)
  @oct14 = oct14&0x7f
  @oct14 += 128 if l
  @oct4 = (oct4&0xef)+16
  @bds[0,1] = uint2str(@oct4,1)
  @bds[10,1] = uint2str(@oct14,1)
  return l
end

#set_simple(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1121

def set_simple(l)
  @oct4 = oct4&0xbf
  @oct4 += 64 unless l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_single(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1157

def set_single(l)
  @oct14 = oct14&0x7f
  @oct14 += 128 unless l
  @oct4 = (oct4&0xef)+16
  @bds[0,1] = uint2str(@oct4,1)
  @bds[10,1] = uint2str(@oct14,1)
  return l
end

#set_spectrum(l) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1112

def set_spectrum(l)
  @oct4 = oct4&0x7f
  @oct4 += 128 if l
  @bds[0,1] = uint2str(@oct4,1)
  return l
end

#set_value(val) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1309

def set_value(val)
  val = val.reshape!(val.length)
  if NArrayMiss===val
    val = val.get_array![val.get_mask!.where]
  end
  dfact = @sgm.pds.dfact
  val = val*10**dfact
  ref = val.min
  val = val-ref
  max = val.max
  nbits = 16
  e =  (Math::log(max)/Math::log(2)).ceil-nbits
  val = val*2**(-e)
  if (nbits%8) == 0
    nstep = 8
  elsif (nbits%4) == 0
    nstep = 4
  elsif (nbits%2) == 0
    nstep == 2
  else
    nstep == 1
  end
  str, bu = data2str(val.to_type(NArray::INT),nstep,nbits)
  @oct4 = (@oct4&15)+bu*16
  @bds[0,1] = uint2str(@oct4,1)
  @bds[1,2] = int2str(e,2)
  s = (ref<0) ? -1 : 1
  ref = ref.abs
  a = (Math::log(ref)/Math::log(16)).ceil+64
  a<0 && raise("invalid range")
  a = 127 if a>127
  b = ref*2**24*16**(64-a)
  a = a*s
  @bds[3,4] = int2str(a,1) << uint2str(b,3)
  @bds[7,1] = uint2str(nbits,1)
  @bds = @bds[0,8] << str
  @sgm.is.update_total_length
end

#simple? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1118

def simple?
  return flag2==0
end

#single? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1154

def single?
  return flag6 && flag6==0
end

#spectrum? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/numru/gphys/grib.rb', line 1109

def spectrum?
  return flag1==1
end

#value(shape, index = nil) ⇒ Object 



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# File 'lib/numru/gphys/grib.rb', line 1210

def value(shape,index=nil)
  nbits_unuse = oct4&15
  @sgm.file.seek(@pos+7, ::IO::SEEK_SET)
  nbits_pack = @sgm.file.read(1).to_uint1
  if (nbits_pack%8) == 0
    nstep = 8
  elsif (nbits_pack%4) == 0
    nstep = 4
  elsif (nbits_pack%2) == 0
    nstep = 2
  else
    nstep = 1
  end
  r = offset
  e = efactor
  map = @sgm.bms.map
  nmiss =  map ? map.count_false : 0
  if flag4==0
    nlen = ((length-3-8)*8-nbits_unuse)/nbits_pack
    nlon,nlat = shape
    (nlon*nlat)==nlen+nmiss || raise("length is not collect")
    if index
      index = index.collect{|el| Fixnum===el ? el..el : el}
      il = index[0]
      i0 = il.first
      i1 = il.last
      i0 = i0 < 0 ? nlon+i0 : i0
      i1 = i1 < 0 ? nlon+i1 : i1
      index[0] = il.exclude_end? ? i0...i1 : i0..i1
      il = index[1]
      i0 = il.first
      i1 = il.last
      i0 = i0 < 0 ? nlat+i0 : i0
      i1 = i1 < 0 ? nlat+i1 : i1
      index[1] = il.exclude_end? ? i0...i1 : i0..i1
      #j = nil
      #i = nil
      if map
        var = NArrayMiss.sfloat(nlon,nlat)
        map.reshape!(nlon,nlat)
        mask = map
        nd = mask.count_true
        wh = mask.where
        if wh.length>0
          var[wh] = @sgm.mbio.read2D(@pos+8, nbits_pack, nd, 1, 0, nd-1, 1, 0, 0, 1, nil, nil, e, r).reshape!(nd)
        end
        var = var[*index]
=begin
        index[1].each{|j|
          jj = j-index[1].first
          sb = j*nlon+index[0].first
          sb = sb-map[true,0..jj-1].count_false if jj>0
          sb = sb*nbits_pack
          eb = sb+mask[true,j].count_true*nbits_pack
          if sb!=eb
            var[mask[true,j].where,jj] = get_value(@sgm.file,@pos+8,sb,eb,nbits_pack,nstep)
          end
        }
=end
      else
        var = @sgm.mbio.read2D(@pos+8, nbits_pack, nlon, nlat, index[0].first, index[0].end, 1, index[1].first, index[1].end, 1, nil, nil, e, r)
=begin
        sb = index[1].first*nlon*nbits_pack
        eb = (index[1].end+1)*nlon*nbits_pack
        var = get_value(@sgm.file,@pos+8,sb,eb,nbits_pack,nstep)
        var.reshape!(nlon, var.length/nlon)
        var = var[index[0],true]
=end
      end
    else
      if map
        eb = nlen*nbits_pack
        var = NArrayMiss.sfloat(nlon,nlat)
#              var[map.where] = get_value(@sgm.file,@pos+8,0,eb,nbits_pack,nstep)
        nd = map.count_true
        var[map.where] = @sgm.mbio.read2D(@pos+8, nbits_pack, nd, 1, 0, nd-1, 1, 0, 0, 1, nil, nil, e, r).reshape!(nd)
      else
=begin
        eb = nlen*nbits_pack
        var = get_value(@sgm.file,@pos+8,0,eb,nbits_pack,nstep)
        var.reshape!(nlon,nlat)
=end
        var = @sgm.mbio.read2D(@pos+8, nbits_pack, nlon, nlat, 0, nlon-1, 1, 0, nlat-1, 1, nil, nil, e, r)
      end
    end
#          var = var*e+r
    return var
  else
    raise "not defined yet"
    n1 = @file.read(2).to_uint2
    @sgm.file.seek(1, ::IO::SEEK_CUR)
    str = @sgm.file.read(6)
    n2 = str.to_uint2
    p1 = str.to_uint2(2)
    p2 = str.to_uint2(4) # @bds[15..16]
    #        width = str2uint( @bds[18..??] )
    #        bitmap = str2uint( @bds[??+1..n1-4] )
  end
end